The Doctor and Ace cannot help him - his death has already happened. Poe will be taken to a hospital and will die in three days time without ever coming out of his coma. But even as the Doctor explains this, the man in the gutter groans and expires. Bewildered, the Doctor hurries Ace back to the Tardis.
Can the Doctor discover what is causing the time anomaly? And will he be able to prevent the universe itself from unravelling when everyone seems to have turned against him? The answer lies in the algebra of ice . . .
